SUNSPOTS 

 MEAN DAILY 

 AREA 



N. HEM? 



80 



LATITUDES OF 

 CENTRES OF 60 

 ACTION 



OF 40 



PROMINENCES 



_ 20 

 N. HEM ? 



J 



1860-0 



1870-0 



MEAN 

 HELIOGRAPHIC 

 LATITUDE OF 



SUN SPOTS 



N. HEM? 



LATITUDES OF 

 CENTRES OF 

 ACTION 



OF 



SUNSPOTS 



N. HEM * 



ZO 

 lo 

 J 

 30-, 

 ZO 

 10 



1880-0 



1890-0 



■ol. 73, Plate 1. 



1900-0 



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■vea iliowingthe relation between the positions of the centres of action of Sunspots or " Spot-activity Tracks " (A), and Solar Prominences or " Prominc, 

 notmty Tracks" (C), the m?nn hcliographic latitude of Sunspots north of the equator (B), and mean daily area of spots (D), for the northern hemisph, 



' continuous and broken vertical lines represent the epochs of suuspot maxima and 



whole solar disc. 



as determined frc 



can daily areas of the 



